Final answer:
The mother country, Great Britain, did give in to most of the demands of the American colonists in the Conciliatory Proposition.
Step-by-step explanation:
The statement in the exercise is true. In the Conciliatory Proposition, the mother country, referring to Great Britain, did give in to most of the demands of the American colonists. This proposition was intended to prevent the American colonies from declaring independence and to reconcile the relationship between the colonies and Britain. However, the colonists rejected the proposition, leading to the continuation of the American Revolution.